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Hi everyone am new to this forum
And this is my first Bmw my BMW was leaking coolent from front
I thought it was the water pump so I replaced the water pump
Not knowing about the weep hole so after I put new water pump on put coolent in the car and it was still leaking so I saw the hole and thought my timing cover had a hole in lol but after coming to this forum found out it was the coolent pipe
And found out I was a big job called a bmw shop here they wanted 4500 for the job
So I found there bimmer pipe and order that with the valley pan and all those gasket
After putting in new pipe putting coolent stop the leak .tryed starting my car engine turned over but battery was weak said in dash recharge battery so I took my battery to auto zone got it charged put it back in the car and tryed to start again this time it would only my a tick sound every time I press start engine so I thought my stater went bed so I got a new stater put in still something now was getting scared and worried cuz I drove the car in my self and after the coolent leak fix the engine turn over now the engine is not turning.so I decided to see is the motor turns by the crank now my problem is my crank only turn half way then locks
Then I can turn it so far back and it locks again my engine is not doing a 360

So now I don't know what's wrong engine manually only turns half way then locks
Then backward half way then locks please help me I don't know what's going on